| R&R Private Limited | Education | 2022 |
| R1 Speed Services Ltd | Administrative & support | 2014 |
| R100 Energy Limited | Energy | 2017 |
| Rabode Ltd | Real estate | 2017 |
| Rachael Eccles Limited | Health & social care | 2016 |
| Rackman Inc. Limited | Real estate | 1998 |
| RAE Foods Limited | Wholesale & retail | 2024 |
| Ralph Day Limited | Agriculture & fishing | 1977 |
| RAS Real Estate Limited | Real estate | 2023 |
| Ravenhill (Holdings) Limited | Financial services | 2012 |
| Rawr Foods Limited | Manufacturing | 2008 |
| Razor Racking Ltd | Extraterritorial | 2025 |
| RCJ Associates Ltd | Professional & scientific | 2002 |
| RDB Operations Ltd | Administrative & support | 2022 |
| RDB Safety Ltd | Construction | 2005 |
| Read Accountancy Ltd | Professional & scientific | 2020 |
| Recruit for Spouses Academy C.I.C. | Administrative & support | 2017 |
| Rectory Gardens Limited | Administrative & support | 2016 |
| Red Everywhere (Lincolnshire) Limited | Education | 2014 |
| Red Everywhere (Yorkshire) Limited | Information & communication | 2024 |
| Redbourne Sewage Company Limited | Households | 2009 |
| Redcliffe International (UK) Limited | Professional & scientific | 2002 |
| Redgate Qhse Consulting Ltd | Professional & scientific | 2024 |
| Redwing Aerospace Ltd | Administrative & support | 2024 |
| Redwing Flight Services Limited | Transport & logistics | 2008 |
| Redwing Flight Training Limited | Education | 2008 |
| Regal Manufacturing Limited | Manufacturing | 1953 |
| Reichspeed Limited | Wholesale & retail | 2016 |
| Reld Property Limited | Real estate | 2021 |
| Remote Business Support Limited | Administrative & support | 2008 |
| Rene Magritte Ltd | Manufacturing | 2025 |
| RESO24 Fitness Centre Ltd | Arts & recreation | 2020 |
| Resoluut CIC | Education | 2021 |
| Retford Logs Limited | Wholesale & retail | 2017 |
| Retrodex Gaming Ltd | Information & communication | 2018 |
| Revolver (Doncaster) Limited | Wholesale & retail | 2010 |
| RG Consulting Ltd | Professional & scientific | 2018 |
| RHE Services Limited | Administrative & support | 2007 |
| RHF Hygiene & Therapy Services Ltd | Health & social care | 2022 |
| Rhys Cole Joinery Ltd | Construction | 2026 |
| Richard Foster Properties Ltd | Real estate | 2026 |
| Richard Storey Limited | Construction | 2013 |
| Rick Hickling Flooring Ltd | Other services | 2017 |
| Riddlestick Theatre Limited | Arts & recreation | 2018 |
| Ride-On Mowers Ltd | Wholesale & retail | 2024 |
| Rituals Hair LAB Ltd | Real estate | 2021 |
| River Beau Sales Ltd | Wholesale & retail | 2025 |
| Riverside Access and Training Centre Gainsborough Limited | Education | 2012 |
| RJ Worsley Consultants Ltd | Professional & scientific | 2025 |
| RJH Inc Ltd | Manufacturing | 2005 |
| RJH Roofing Ltd | Construction | 2025 |
| RJL GAS Services Ltd | Construction | 2025 |
| RM Home Services Ltd | Real estate | 2025 |
| RMG Construction Retford Ltd | Construction | 2016 |
| Rnexchange Ltd | Wholesale & retail | 2021 |
| Road Rescue Recovery Limited | Transport & logistics | 2016 |
| ROB Ahmed F2F Ltd | Transport & logistics | 2022 |
| ROB Boston Racing Ltd | Other services | 2017 |
| Roberts (AJ) Consultancy Ltd | Financial services | 2012 |
| Robo-Mowers Ltd | Wholesale & retail | 2025 |
| Rodale Ventures Limited | Professional & scientific | 2019 |
| Roja Devi Ltd | Wholesale & retail | 2022 |
| Rolebi Ltd | Administrative & support | 2021 |
| RON Gale & Sons Limited | Construction | 2004 |
| Ronis Holdings Ltd | Real estate | 2026 |
| Ronis Power and Control Ltd | Manufacturing | 2021 |
| Roof and Driveway Specialists Ltd | Construction | 2025 |
| Roofcare Plus Ltd | Construction | 2020 |
| Roofing Outlaw (Gainsborough) Ltd | Wholesale & retail | 2026 |
| Rookery Aesthetic Ltd. | Health & social care | 2016 |
| Rookery Healthcare Ltd | Health & social care | 2022 |
| Rose Regeneration Limited | Professional & scientific | 2008 |
| Rosevale Costumes Limited | Wholesale & retail | 2026 |
| Roterwolf Canine Services Ltd | Administrative & support | 2025 |
| Rotten Thursdays Limited | Wholesale & retail | 2026 |
| Rowa Property Ltd | Real estate | 2024 |
| Rowbottom Holdings Limited | Real estate | 2008 |
| Roxy Residential & Comercail Property Limited | Real estate | 2024 |
| Roycar Limited | Agriculture & fishing | 2017 |
| Royl Ltd | Transport & logistics | 2025 |
| RRR Consultancy Limited | Professional & scientific | 2010 |
| RRW Properties Limited | Real estate | 2026 |
| Ruby Deluxe Vending Ltd | Wholesale & retail | 2026 |
| Rubymark Limited | Mining & quarrying | 2018 |
| Runway EW Limited | Other services | 2024 |
| Rural Progressions Ltd | Financial services | 2023 |
| Ruth Heron Executive Coach & Consultancy Ltd | Other services | 2023 |
| Rutherford Wren Limited | Wholesale & retail | 2013 |
| Ruthless Rebellion Ltd | Professional & scientific | 2026 |
| RW Tree Services Ltd | Administrative & support | 2026 |
| Rwafatransport Ltd | Transport & logistics | 2024 |
| Ryan Manufacturing Limited | Manufacturing | 2015 |
| Ryan's Power & Control UK Ltd | Construction | 2026 |
| S & a @ NO54 Limited | Hospitality | 2025 |
| S & B Kitchen Installations Ltd | Manufacturing | 2024 |
| S & C Rose Properties Limited | Real estate | 2015 |
| S E Lettings Ltd | Other services | 2021 |
| S F Shop Fitting Ltd | Construction | 2018 |
| S J Gaffney Limited | Other services | 2021 |
| S Johnson Traffic Management Limited | Professional & scientific | 2023 |